Brake booster with tall valve covers? - Team Camaro Tech
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post #1 of 14 (permalink) Old Aug 6th, 17, 02:33 PM Thread Starter
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Bruce
 
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Brake booster with tall valve covers?

Manual drum / drum. I don't remember them being so bad when I was in HS with my 67 Camaro back then. Probably just in better shape

Just put in a 383 stroker with tall valve covers. Anyone know what size brake booster I can install?

I'd love the hyroboost, but don't want to shell out the cash.

From what I've read, I CAN use the existing master cylinder with a booster, correct???

What about the brake lines, can they just be repositioned once the booster is installed?

Thanks for the help.
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post #2 of 14 (permalink) Old Aug 6th, 17, 04:56 PM
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Re: Brake booster with tall valve covers?

This is from memory which is usually suspect these days.

Manual drum brakes used a 7/8th inch bore size master cylinder:
manual disc brakes used a 1 inch bore size master cylinder; and finally
power disc brakes used a 1-1/8th inch master cylinder bore size.

As bore size increased cylinder stroke (distance from off the floor to full pedal) changed and there are two holes in the brake pedal to reflect this difference. Bottom hole had the longest stroke and was the manual brake position. Power assisted brakes used top hole since the booster augmented brake pedal effort (less leverage).

Further the master cylinder pistons and rods had different ends where the rod interacted with the piston and the rod. Some pistons were recessed and cupped others were flush and had a small dimple. Rod lengths changed to match the master cylinder. Get any one of these parts wrong (not correct), and you will have brake issues.

Difference in port size was to segregate the front brakes from the back brakes, but the pressure at both ports is the same. If you can bend the lines to fit without kinking them the wrong part with the reversed ports will work.

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post #3 of 14 (permalink) Old Aug 7th, 17, 11:55 AM Thread Starter
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Bruce
 
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Re: Brake booster with tall valve covers?

Thanks for the response Dave. What I really need to know is seeing that I have a small block with tall valve covers, how do I determine what size booster will fit in the space where the booster will mount?

Is it as simple as saying a 11" booster extends exactly 5.5" in each direction? 5.5" from where, the center of the bracket?

I don't want to order a booster only to find out it won't fit. I've heard of people with tall valve covers having clearance issues.

Thanks!
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post #4 of 14 (permalink) Old Aug 7th, 17, 02:18 PM
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Re: Brake booster with tall valve covers?

Depends upon the heads and the valve cover. So far as I know the only engine I ever had issues with booster clearance was a tall valve cover on a BBC, never a SBC. A aftermarket head has taller rails that the valve cover bolt to, and of course tall valve covers area fashion statement, as they are not needed without a stud girdle sitting on top of your roller rockers.

Here are CompCams roller rockers that fit just fine under stock cast valve covers on my 406.





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post #5 of 14 (permalink) Old Aug 7th, 17, 04:58 PM
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Re: Brake booster with tall valve covers?

I have 4" valve covers and a 11" booster
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post #6 of 14 (permalink) Old Aug 7th, 17, 05:01 PM
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Re: Brake booster with tall valve covers?

Tall covers will NOT be able for removing & installing as they will hit the booster.
Something you should think about if valve rocker maintenance is needed.
Booster will have to be removed for cover action.

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post #7 of 14 (permalink) Old Aug 7th, 17, 05:08 PM
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Re: Brake booster with tall valve covers?

Quote:
Originally Posted by Everett#2390 View Post
Tall covers will NOT be able for removing & installing as they will hit the booster.
Something you should think about if valve rocker maintenance is needed.
Booster will have to be removed for cover action.
Everett
I have no problem what so ever removing the valve cover under the 11" boster
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post #8 of 14 (permalink) Old Aug 7th, 17, 09:28 PM Thread Starter
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Re: Brake booster with tall valve covers?

Thanks to everyone. It's been very helpful. If I can find maybe a 10 inch booster just to be safe I might go that route.

I have Edelbrock E-tech heads with comp roller rockers. My standard valve covers wouldn't fit, I tried.

I want to get this done before I put the hood on. I understand the bottom two nuts can be very difficult to get on. I've heard it's easier if the hood is off
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post #9 of 14 (permalink) Old Aug 7th, 17, 09:29 PM Thread Starter
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Re: Brake booster with tall valve covers?

Quote:
Originally Posted by flat tire View Post
I have 4" valve covers and a 11" booster
Thank you Kevin, that picture is very helpful. I Assume it's pretty much the same on my 67 Camaro
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post #10 of 14 (permalink) Old Aug 7th, 17, 10:50 PM Thread Starter
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Re: Brake booster with tall valve covers?

I just noticed, where does that booster vacuum line connect? It appears to go under the fender.
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post #11 of 14 (permalink) Old Aug 8th, 17, 04:17 AM
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Re: Brake booster with tall valve covers?

I run a vacuum canister because of the cam. the line from the booster would normally attach to the back of the carb. on this application
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post #12 of 14 (permalink) Old Aug 8th, 17, 07:27 AM
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Re: Brake booster with tall valve covers?

Quote:
Originally Posted by flat tire View Post
Everett, I have no problem what so ever removing the valve cover under the 11" boster
I see, I have about 2.5 inches between the installed OE cover and booster.
I will have to measure & picture for comparison.
What heklps you, is you have '69 alternator mounting and you can remove/install the cover from the front.
I have OE drvr side mount and alt is in the way.and onlt direction for cover is from the carb side of head.

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post #13 of 14 (permalink) Old Aug 9th, 17, 07:24 AM
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Re: Brake booster with tall valve covers?

i run a small block 406 with aftermarket heads that have raised rails and the standard TALL valve covers ( no angles cut at edges, just squared off) in my 67. I have an 11" booster without problem with the valve covers. the problem i have on my 67 is the wiper motor. to remove the driver side valve cover i have to unscrew the wiper motor and let it hang by the arm
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post #14 of 14 (permalink) Old Aug 9th, 17, 07:53 AM Thread Starter
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Re: Brake booster with tall valve covers?

Perfect, thanks. My wiper motor interferes with mine, but I can manipulate it around. That's pretty much exactly what I needed to hear. I'll buy my booster today.
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